Title :
Community Energy Storage for Neutral Voltage Rise Mitigation in Four-Wire Multigrounded LV Feeders With Unbalanced Solar PV Allocation
Author :
Alam, M.J.E. ; Muttaqi, Kashem M. ; Sutanto, Danny
Author_Institution :
Global Change Inst., Univ. of Queensland, St. Lucia, QLD, Australia
Abstract :
The traditional neutral voltage problem in low-voltage (LV) four-wire multigrounded distribution networks can be aggravated due to an unbalanced allocation of one-phase photovoltaic (PV) units. Inherent limitations restrict the performance of the traditional strategies to mitigate the combined effect of load and PV unbalance. To overcome the shortcoming of traditional approaches, a new dynamic mitigation approach using community energy storage (CES) is proposed in this paper. A power balancing algorithm is developed to perform the balancing operation while minimizing power drawn from the CES. A charge/discharge control strategy is developed that will continuously balance and dynamically adjust the power exchange with the grid in a real time, and mitigate the neutral current and neutral voltage rise. To investigate the applicability of the proposed approach under physical time delays associated with battery and PV systems, a suitable dynamic model is developed. An Australian LV distribution system is used to verify the proposed approach under daylong variations of load and PV, and also during short-term variations of PV output caused by cloud passing.
Keywords :
distribution networks; energy storage; photovoltaic power systems; power control; power grids; power markets; solar power; Australian LV distribution system; PV unbalance; charge-discharge control strategy; community energy storage; four-wire multigrounded LV feeders; neutral current mitigation; neutral voltage rise mitigation; power balancing algorithm; power exchange; unbalanced solar PV allocation; Energy storage; Grounding; Load management; Photovoltaic systems; Resource management; Community energy storage (CES); four-wire multigrounded low-voltage (LV) network; neutral current; neutral voltage rise; solar photovoltaic (PV);
Journal_Title :
Smart Grid, IEEE Transactions on
DOI :
10.1109/TSG.2015.2427872